>>9420185 lb

I've noticed this too.

Also check the recent big video game titled Death Stranding. The story is set in an apocalyptic U.S., where a cataclysmic event caused destructive creatures from a realm between life and death to begin roaming the Earth. The mysterious entities are otherworldly creatures that have somehow "stranded" into our world.

http://www.kojimaproductions.jp/en/death_stranding.html

I don't know, but my guess is that black goo is symbolism for evil spiritual forces spreading over humanity and the world like a malevolent invador, infecting, corrupting, taking over all that it comes into contact with.